Working papers results

The standard Real Business Cycle literature mainly focuses on Walrasian models designed to fit the US institutional framework. Differences between the US and Europe, mostly evident in the labor market, suggest that a purely Walrasian model may be inappropriate to study European business cycles. We present a stochastic version of the dynamic general equilibrium model in Daveri and Maffezzoli (2000), where unemployment is generated by monopolistic unions, and calibrate it to reproduce several long-run features of the Italian and US economies. The properties of our model are compared to the corresponding ones of Rogerson and Wrights indivisible labor model. We focus on the standard business cycle statistics, the impulse response functions, and the ability to reproduce the cyclical components of the main macroeconomic variables. We conclude that: (i) the business cycle statistics are observationally equivalent in small samples; (ii) the impulse response functions of the Monopoly Union (MU) model show a higher degree of overall persistence; (iii) the MU model enjoys a statistically significative advantage in reproducing the Italian business cycles, while its alternative seems to better explain the US business cycles.

The "Stability and Growth Pact" introduces deficit stabilization as a new interesting objective of debt management. The interest payments on public debt may serve as an important buffer against the budget consequences of cyclical downturns and unexpected deflation. The optimal debt composition depends on the correlations between interest rates, output and inflation. Estimated correlations for the period 1960-1998 and the implied debt compositions provide benchmarks for implications regarding the EMU. The paper explores how relevant correlations between output, inflation and interest rates may have changed with the shift in the monetary policy regime and thus how the debt composition, which stabilizes the deficit, has changed. A longer maturity structure of conventional debt is optimal if the ECB places a lower weight on output stabilization than the national monetary authorities and if EMU member states are hit by asymmetric shocks. Short term conventional debt should instead be issued by countries which experience a relatively higher output and inflation uncertainty and a lower sensitivity of aggregate demand to interest-rate changes. The optimal share of inflation-indexed debt is largest in a strict inflation targeting regime; the lower the weight that the ECB assigns to output stabilization, the more attractive is inflation indexation for deficit stabilization.

In this paper we concentrate on the consequences for the European stock market of a correction of the US Stock market. We explicitly consider the distinction between interdependence and contagion. We provide separate answers to the following questions: (i) is there long-term interdependence between US and Europe, i.e. does the equilibrium for European shares depend on the equilibrium for US shares ? (ii) Is there short-term interdependence and contagion between US and European stock markets, i.e do short term fluctuations of the US share prices spill over to European share prices and is such co-movement stable in occasion of the occurrence of high volatility episodes?

This paper is a general investigation of temporal aggregation in time series analysis. It encompasses traditional research on time aggregation as a particular case and extends the analysis to irregular intervals of aggregation. The Data Generating Process is allowed to evolve at regular, deterministic- irregular or even stochastic intervals of time (operational time). The time scale of this process is then transformed to generate the observational time process. This transformation can be deterministic (such as the familiar aggregation of monthly data into quarters) or more generally, stochastic (such as aggregating stock market quotes by the hour). In general, the observational time model exhibits persistence, time-varying parameters and non-spherical disturbances. Consequently, we review detection, specification, estimation and structural inference in this context, provide new solutions to these issues, and apply our results to high frequency, FX data.

This paper addresses the issue of whether and by how much public capital can enhance economic performance. We apply different methodologies to Italian regional data for the period 1970-1994. The results are presented for Italy as a whole and for different macroregions, and for individual categories of public capital. For the Center and the South, the methodologies employed indicate a positive contribution of infrastructure investment to TFP growth, output, and cost reduction. However, the magnitude of the cost reducing effect does not seem large enough to outweigh the social user cost of public capital. Also, we get mixed results on which types of infrastructure are most effective. Overall, investment in transportation appears to be the most productive: railways in the North and roads in the Center and South are the categories that mostly contributed to TFP growth.

This paper surveys some recent literature on fiscal policy and comparative politics. Economic policy is viewed as the outcome of a game with multiple-principals and multiple-agents. Opportunistic politicians bargain over policy. Rational voters hold them accountable through retrospective voting. Political institutions determine the rules for legislative bargaining and for electing politicians to office. The questions asked are: how do alternative electoral rules and alternative regime types shape the size of government, the composition of spending, the performance of politicians in terms of effort or corruption, the features of electoral cycles. The paper discusses both theory and evidence, and concludes with some speculations about directions for future research.

This paper investigates the determinants of group membership, and in particular the effect of income inequality on individual incentives to join economic groups. Drawing on a simple model, we show that an increase in inequality has an ambiguous effect and that the type of access rule (open versus restricted access) is key in determining what income categories are represented in the group. Furthermore, the shape of the income distribution can be crucial to determine whether increased inequality leads to more or less group participation. Using survey data from rural Tanzania we find that inequality at the village level has a negative impact on the likelihood that the respondents are members of any group. This effect is particularly significant for relatively wealthier people, both when relative wealth is "objectively" measured, and when it is "subjectively" defined. However, when we disaggregate groups by type of access rule, we find that inequality decreases participation in open access groups when there are wide disparities at the bottom of the distribution, while it increases participation in restricted access groups when the disparities are around the middle and top part of the distribution. Finally we assess the impact of inequality on various dimensions of group functioning.

We propose a general framework to study whether and how common trends and common cycles are still present when the original variables are linearly aggregated or only a subset of them is analysed. This is particularly important because of the adoption in empirical analysis of aggregated data on a limited number of variables.

This paper develops tests for selection of competing non-linear dynamic models. The null hypothesis is that the models are equally close the Data Generating Process (DGP), according to a certain measure of closeness. The alternative is that one model is closer to the DGP. The models can be non-nested, overlapping, or nested. They can be correctly specified or not. Their parameters can be estimated by a variety of methods, including Maximum Likelihood, Non-Linear Least Squares, Method of Moments, where the choice depends on the selected measure of closeness to the DGP. The tests are symmetric and directional. Their asymptotic distribution under the null is either normal or a weighted sum of chi-square distributions, depending on the nesting characteristics of the competing models. The comparison of ARMAX and STAR models, and of nested ARMAX-GARCH models are discussed as examples.

The increasing literature on the interactions between liberalisation-integration of product markets and labour market reforms is often highly speculative and draws on a rather weak empirical basis. Cross-country indicators of regulatory frameworks are often lacking, making it difficult to identify the linkages with observed outcomes in the labour and product markets. Moreover, empirical studies have often focused exclusively on the impact of certain labour market regulations, largely ignoring the role of product market regulations and the interactions between regulatory interventions in the two markets. As a result, while there are convincing theoretical arguments pointing to a potentially positive effect of product market liberalisation on labour market performance, empirical investigations of this issue are lacking. This paper aims at providing some preliminary evidence on these issues. In particular, the cross-country patterns and changing profile of product and labour market regulations are identified. Evidence on the relationships between product and labour market regulations is discussed in the context of other policies and institutional factors affecting the labour market; and the clustering and convergence of institutions across countries are characterised. More importantly, the paper reports evidence of a potentially significant impact of product and labour market regulations on employment and its composition. The evidence presented draws heavily on a novel set of cross-country indicators of regulation in the product and labour markets assembled at the OECD. It should be stressed at the outset that these indicators are preliminary estimates and should be taken only as rough approximations of the regulatory stance across OECD countries.